Tuple<T1,T2,T3,T4,T5,T6>.IStructuralEquatable.Equals(Object, IEqualityComparer) Tuple<T1,T2,T3,T4,T5,T6>.IStructuralEquatable.Equals(Object, IEqualityComparer) Tuple<T1,T2,T3,T4,T5,T6>.IStructuralEquatable.Equals(Object, IEqualityComparer) Method

Definition

Gibt einen Wert zurück, der auf Grundlage einer angegebenen Vergleichsmethode angibt, ob das aktuelle Tuple<T1,T2,T3,T4,T5,T6>-Objekt gleich einem angegebenen Objekt ist.Returns a value that indicates whether the current Tuple<T1,T2,T3,T4,T5,T6> object is equal to a specified object based on a specified comparison method.

 virtual bool System.Collections.IStructuralEquatable.Equals(System::Object ^ other, System::Collections::IEqualityComparer ^ comparer) = System::Collections::IStructuralEquatable::Equals;
bool IStructuralEquatable.Equals (object other, System.Collections.IEqualityComparer comparer);
Function Equals (other As Object, comparer As IEqualityComparer) As Boolean Implements IStructuralEquatable.Equals

Parameter

other
Object Object Object

Das Objekt, das mit dieser Instanz verglichen werden soll.The object to compare with this instance.

comparer
IEqualityComparer IEqualityComparer IEqualityComparer

Ein Objekt, das die Methode definiert, mit der ermittelt wird, ob die beiden Objekte gleich sind.An object that defines the method to use to evaluate whether the two objects are equal.

Gibt zurück

true, wenn die aktuelle Instanz gleich dem angegebenen Objekt ist, andernfalls false.true if the current instance is equal to the specified object; otherwise, false.

Implementiert

Beispiele

Das folgende Beispiel definiert eine RateComparer -Klasse, die einen benutzerdefinierten Test auf Gleichheit ausführt.The following example defines a RateComparer class that performs a custom test for equality. Wenn die Werte, die übergeben werden, die IStructuralEquatable.Equals Methode sind vom Typ Single oder Double, die Methode testet auf Gleichheit mit nur bis zu drei Dezimalstellen.If the values that are passed to its IStructuralEquatable.Equals method are of type Single or Double, the method tests for equality by using only up to three fractional digits. Andernfalls ruft sie die x des Parameters Equals Methode.Otherwise, it simply calls the x parameter's Equals method. Im Beispiel wird dies IEqualityComparer Implementierung, um festzustellen, ob vier Tuple<T1,T2,T3,T4,T5,T6> Objekte, die Daten auf die Geschwindigkeit der Änderung der Auffüllung von 1960 bis 2000 enthalten sind gleich.The example uses this IEqualityComparer implementation to determine whether four Tuple<T1,T2,T3,T4,T5,T6> objects that contain data on the rate of population change between 1960 and 2000 are equal.

using System;
using System.Collections;

public class RateComparer<T1, T2, T3, T4, T5, T6> : IEqualityComparer
{
   private int argument = 0;

   public new bool Equals(object x, object y) 
   {
      argument++;
      if (argument == 1) return true;

      double fx, fy; 
      if (x is Double || x is Single)
      {
            fx = (double) x;
            fy = (double) y;
            return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000));
      }
      else
      {
         return x.Equals(y);
      }
   }
   
   public int GetHashCode(object obj)
   {
      if (obj is Single || obj is Double)
         return Math.Round(((double) obj) * 1000).GetHashCode();
      else
         return obj.GetHashCode();
   }                
}

public class Example
{
   public static void Main()
   {
      var rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792);
      var rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079);
      var rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912);
      IStructuralEquatable eq = rate1;
      // Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString());
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, new RateComparer<string, double, double, double, double, double>()));
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, new RateComparer<string, double, double, double, double, double>()));
   }
}
// The example displays the following output:
//    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
//       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
//       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False
Imports System.Collections

Public Class RateComparer(Of T1, T2, T3, T4, T5, T6) : Implements IEqualityComparer
   Private argument As Integer = 0

   Public Overloads Function Equals(x As Object, y As Object) As Boolean _
                   Implements IEqualityComparer.Equals
      argument += 1
      If argument = 1 Then
         Return True
      Else
         Dim fx, fy As Double
         If typeof x Is Double Or typeof x Is Single Then
            fx = CDbl(x)
            fy = CDbl(y)
            Return Math.Round(fx * 1000).Equals(Math.Round(fy * 1000))
         Else
            Return x.Equals(y)
         End If
      End If   
   End Function
   
   Public Overloads Function GetHashCode(obj As Object) As Integer _
                    Implements IEqualityComparer.GetHashCode
      If TypeOf(obj) Is Single Or TypeOf(obj) Is Double Then
         Return Math.Round(CDbl(obj) * 1000).GetHashCode()
      Else
         Return obj.GetHashCode()
      End If
   End Function                
End Class

Module Example
   Public Sub Main()
      Dim rate1 = Tuple.Create("New York", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate2 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .0290792)
      Dim rate3 = Tuple.Create("Unknown City", .014505, -.1042733, 
                               .0354833, .093644, .029079)
      Dim rate4 = Tuple.Create("San Francisco", -.0332858, -.0512803, 
                               .0662544, .0728964, .0491912)
      Dim eq As IStructuralEquatable = rate1
      ' Compare first tuple with remaining two tuples.
      Console.WriteLine("{0} = ", rate1.ToString())
      Console.WriteLine("   {0} : {1}", rate2, 
                        eq.Equals(rate2, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate3, 
                        eq.Equals(rate3, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
      Console.WriteLine("   {0} : {1}", rate4, 
                        eq.Equals(rate4, New RateComparer(Of String, Double, Double, Double, Double, Double)()))
   End Sub
End Module
' The example displays the following output:
'    (New York, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) =
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.0290792) : True
'       (Unknown City, 0.014505, -0.1042733, 0.0354833, 0.093644, 0.029079) : True
'       (San Francisco, -0.0332858, -0.0512803, 0.0662544, 0.0728964, 0.0491912) : False

Hinweise

Bei diesem Member handelt es sich um eine explizite Schnittstellenmemberimplementierung.This member is an explicit interface member implementation. Er kann nur verwendet werden, wenn die Tuple<T1,T2,T3,T4,T5,T6>-Instanz in eine IStructuralEquatable-Schnittstelle umgewandelt wird.It can be used only when the Tuple<T1,T2,T3,T4,T5,T6> instance is cast to an IStructuralEquatable interface.

Die IEqualityComparer.Equals Implementierung wird nur aufgerufen, wenn other nicht null, und ob es erfolgreich sein kann umgewandelt (in C#) oder Konvertierung (in Visual Basic) eine Tuple<T1,T2,T3,T4,T5,T6> Objekt, dessen Komponenten von demselben Typ wie die aktuelle Instanz.The IEqualityComparer.Equals implementation is called only if other is not null, and if it can be successfully cast (in C#) or converted (in Visual Basic) to a Tuple<T1,T2,T3,T4,T5,T6> object whose components are of the same types as the current instance. Die IStructuralEquatable.Equals(Object, IEqualityComparer) -Methode übergibt zuerst die Item1 Werte der Tuple<T1,T2,T3,T4,T5,T6> zu zu vergleichenden Objekte die IEqualityComparer.Equals Implementierung.The IStructuralEquatable.Equals(Object, IEqualityComparer) method first passes the Item1 values of the Tuple<T1,T2,T3,T4,T5,T6> objects to be compared to the IEqualityComparer.Equals implementation. Wenn dieser Methodenaufruf gibt true, die Methode erneut aufgerufen, und übergeben die Item2 Werte der beiden Tuple<T1,T2,T3,T4,T5,T6> Objekte.If this method call returns true, the method is called again and passed the Item2 values of the two Tuple<T1,T2,T3,T4,T5,T6> objects. Dieser Vorgang wird fortgesetzt, bis der Methodenaufruf zurückkehrt false Wenn es vergleicht ein bestimmtes Tabellenpaar Item Werte oder die beiden Item6 Werte werden an die Methode übergeben.This continues until the method call returns false when it compares a specific pair of Item values, or the two Item6 values are passed to the method.

Gilt für: